Safety lock



A. GISIGER SAFETY Loox Feb. 1 7, 1953 Original Filed March 8, 1949Patented Feb. 17, 1953 UNITEDl STATES PATENT OFFICE SAFETY LOCK ArminGisiger, Salzach, Switzerland Original application March 8, 1949, SerialNo. 80,340. Divided and this application July 8, 1950, Serial No.172,640. In Switzerland January 6, 1949 5 Claims.

The invention relates to safety locks comprising a rotatable safety bodyand a lock member operable by said body.

This application is a division of my pending Patent application Ser. No.80,240, led March 8, 1949, now abandoned.

In the lock embodiment shown in my application Ser. No. 80,340 a lever16 pivotally mounted on the lock case operates with the rotatable safetybody on the one hand, and with the lock member 17 on the other hand. Theclosing movement of the lock member 17 is caused .by the lever 16against the constraint of a spring 33; This spring achieves the returnmovement of the lock member from the closing position to the openingposition, as soon as the lever 16 is released by the rotary safety body.Locks of this kind show the disadvantage that the spring is unable towithdraw the lock member if for any reason a lateral pressure is exertedon the lock member so C that the friction occurring between the lockmember and its guide in the lock case cannot be overcome by the spring.

Object of my invention is to remedy this inconvenience.

Another object of my invention is to provide a control membercooperating with the safety body and being tiltably mounted on the lockmember, the tiltable control member, in its end positions,

bearing against stops of the lock member, whereby it is rigidlyconnected with the lock member to open and close the latter on rotationof the safety |body.

Another object of my invention is to provide springy means alternatelyacting upon the tiltable control member to bring the latter intoengagement with said rotatable safety body.

A further feature of my invention is that the springy parts alternatelyIpress the tiltable control member against rotatable tumblers providedwith cut-outs, in order to bring the tiltable control member at rst intoengagement with a groove as soon as the latter has been formed by thecut-outs having beenbrought into alignment with one another by rotationof the key, so that afterwards the tiltable control member is pressedagainst one of the stops of the lock member.

Other objects and features will be apparent as the following descriptionproceeds, reference being had to the accompanying drawing, illustrating,by way oi example, one embodiment of my invention, and wherein Fig. l isa top View of the interior of the lock casing, and

Fig. 2 is a section along the line Ila-,II of Fig. l.

(Cl. 'HF-134) The lock member or bolt l1 and the cylinder 34 are mountedin the lock case 45. The lock member Il is to be moved to and fro. Thecylinder 34, which is rotatable, comprises in its interior a certainnumber of tumblers 32 with cut-outs I5 and cams l2 which are tocooperate with corresponding cams of a key not shown. Adjacent tumblers32 rotatable in the cylinder 34 are separated from each other byintermediate Washers 21 which, by noses 33 engaging -a cut-out 33 of thecylinder 34, are fastened against rotation relative to the cylinder 34.About in the middle of the length of the-cylinder 34 there is a dummytumbler 39 fastened against rotation relative to the cylinder '34 in thesame manner as the intermediate washers 21. This dummy tumbler 39 has acam 40. The intermediate layer and the dummy tumbler 39 comprisecut-outs 4I having the same shape as the cut-outs l5 of the tumblers 32.While the cut-outs 4l of the intermediate washers and of the dummytumbler are continuously aligned with regard to one another, i. e. liecontinuously in the same sector of the cylinder 34, the tumblers 32, onthe other hand, may be rotated by means of the key not shown from aposition in which the cut-outs l5 of the tumblers are not in alignment.with the cut-outs 4| of the intermediate washers and of the dummytumbler to a position in which all thecut-outs I5, 4l are aligned toform a groove. Fig. 1 shows how an arm 43 of a tilting control member I6pivotally mounted on the lock bolt l1 engages this groove. A springhaving two arms 33 is xed to the lock case 45 while the lock bolt llcarries two stops 44. In Fig. l the tilting member |6 is under theconstraint of the left-hand spring-arm 33 and is pressed onto theright-hand stop 44. Now, if the rotary safety body comprising thetumblers 32 is turned by the key not shown out of the position of Fig. 1in a clockwse direction, the left-hand side edges of the cutouts I5press onto the arm 43 of the tilting member IB and due to the fact thatthe latter bears against the righthand stop 44 so that a rigidconnection exi-stsbetween the tilting member IB and the lock bolt IT,the lock bolt, together with the tilting member I6 is moved towards therightinto closing position, while the arm 43 finally leaves the grooveand locks the bolt l1 against return movement owing to its beingsupported on the circumference of the tumblers 32. If it lbe desired tounlock the lock again by turning the key in the anticlockwise directionof Fig. l, the right-hand arm 33 oi the spring turns the tilting memberI6 in the clockwise direction at the momen-t when the cutouts I5 comeinto reach of the arm t3, so that the latter enters the groove and thetilting member I6 fin-ally bears against the left-hand stop M. Now, arigid connection between the tilting member I5 and the lock bolt l1exists again, allowing the latter to be moved towards the left into theposition shown in Fig. 1. Now, on continuing .the opening movement ofthe key, the tumblers 32 are turned relatively to the intermediatewashers 2l and to the dummy tumbler 39, the arm 43 leaves the cut-outsand the abovementioned groove no longer exists. Now, the arm 43 of thetilting member I6, under the constraint of the left-hand spring arm 33bears against the circumference of the tumblers 32. If it be now triedto close the lock by means of a key not set to the combination of thelock, in that this key is rotated in the clockwise direction of Fig. 1,there is n possibility of all the cut-outs I 5 of the tumblers 32 beingaligned with the cut-outs il of the washers 27 and of' the. dummytumbler 38. Therefore, the tilting member I S cannot be operated by thesafety body comprising the tumblers. However, if the tumblers 32 areturned by the correctly set key, their cut-outs I areY aligned with thecut-outs 4i cf the washers 27 and of the dummy tumbler 39. As soon asthis alignment occurs, the left-hand spring arm 33 makes the arm i3 ofthe tilting member I6 enter the. now existing groove `and the positionshown in Fig. 1 is again reached. `Similar conditions occur on openingthe lock.

From the above it follows that both the closing. movement and theopening movement of the lock member H are positively executed by therotary safety body owing to the rigid connection alternatelyYestablished between one of the stops it and the tilting member l..Therefore, operation of the lock member l1 by means of a spring isomitted. The springy |parts 33 sei-.ve merely the purpose of. bringingthe tilting member l5 into engagement with the tumblers.

While I havel described and illustrated one embodiment of my invention,I do not wish to unnecessarily limit the scope of my invention, butreserve the right to make such. modifications and rearrangements of theseveral parts as may come Within the purview of the. laccompanyingclaims:

What I claim is:

l. In Ia safety lock, in combination, a lock case; a lock membershiftably mounted in said lock case; a control member pivotally mountedon said lock member; stop means xedly secured to said lock member andadapted to block said control member in two angularly spaced positionsof the same against movement relative to said lock member in onedirection; and rotatable means adapted to be rotated by a proper key andduring such rotation engaging and pivoting said control member into oneof said positions whereupon further rotation of saidY rotatable means inthe same direction causes shifting of said lock member.

2. In a safety lock, in combination, a lock case; a lock membershiftably mounted in said lock case; a control member pivotally mountedon said lock member; stop means iixedly secured to said lock member andadapted to block said control member in two angularly spaced positionsof the same against movement relative to said lock member in onedirection; rotatable means adapted to be rotated by a proper key andduring such rotation engaging and pivoting said control member into oneof said positions whereupon further rotation of said rotatable meansinthe same direction causes shifting of said lock member; and spring meansurging said control member to pivot into engagement with said rotatablemeans.

3, In a safety lock, in combination, a lock case; a lock membershiftably mounted on said lock case; a plurality of parallel at tumblersmounted rotatably about a common axis in said lock case and havingnotches in the periphery thereof adapted to be aligned in the directionof the axis of rotation of said tumblers when said tumblers lare rotatedby proper key; a spring loaded tiltable control member pivotally mountedon said lock member and having a projecting edge portion pressingagainst the periphery of said tumblers and extending in the direction ofsaid axis of rotation thereof so as toengage a groove formed by alignednotches in said tumblers; stop means xedly secured to said lock memberand adapted to block said control member in two angularly spacedpositions thereof against move mentrelative to said lock member in onedirection so that further rotation of saidV tumblers after said controlmember engages said stop means effects shifting of said control member.

4. In a safety lock, in combination, a lock case; a lock membershiftably mounted on said lock case; a cylindrical hollow memberrotatably mounted insaid lock case and being formed with a cut-outopening in the wall thereof; tumbler discs rotatably mounted in saidcylindrical hollow member coaxially therewith, each of said tumblerdiscs having a notch in thev periphery thereof adapted to register withsaid cut-out opening the wall of said cylindrical hollow member whenrotated upon insertion of a proper key; a tiltable control memberpivotally mounted on said lock member and having a projection projectinginto said cut-out openingin said cylindrical member, and adapted toproject: into said notches when the same are registering with saidcut-cut open ing; and stop means flxedly secured to said lock member andblocking said tiltable control member in two angularly spaced positionsthereof against rotating relative to said locking member in onedirection so that rotation of said tumbler discs effects pivoting ofsaid control member to one of said positions whereupon further rotationof said tumbler discs effects. shifting of said lock member.

5.. In a safety lock, in combination, a lock case; a lock membershiftably mounted on said lock case; a cylindrical hollow memberrotatably mounted in said lock case and being formed with a cutf-outopening in the wall thereof; tumbler discs rotatably mounted in saidcylindrical hollow member coaxially therewith, each of said tumblerdiscs having a notch in the periphery thereof yadapted to register withsaid cut-out opening in the wall of said cylindrical hollow member whenrotated upon insertion of a proper key; a tiltable control memberpivotally mounted on said lock member and having a projection projectinginto said cut-outopening in said cylindrical member, and adapted toproject into said notches when the same are registering with said cutoutopening; stop means xedly secured to sai-:l lock member and blockingsaid tiltable control member in two angularly spaced positions thereofagainst rotating relative to said locking member in one direction sothat rotation of said tumbler discs effects pivoting of said controlmember to one of said positions whereupon further rotation of saidtumbler discs effects shifting of said lock member; and spring meansurging said control member to engage the periphery of said tumbler discswith said projection so as to engage with said projection a. grooveformed by said notches when aligned and registering with said cut-outopening.

ARMIN GSIGER.

REFERENCES CITED The following references are of record in the ille ofthis patent:

6 UNITED STATES PATENTS Number Number Name Dente Sullivan Aug. 2Q, 1867Diebold July 7, 1925 FOREIGN PATENTS Country Date France Mar. 2l, i934

